2027 ICD-10-CM Diagnosis Code M05Rheumatoid arthritis with rheumatoid factor

ICD-10-CM Codes›M00–M99›M05-M14›M05

ICD-10-CM M05
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

M05 is a non-billable ICD-10-CM category code for rheumatoid arthritis with rheumatoid factor, so it cannot be submitted on claims. Use a more specific code from this category instead, such as M05.00, M05.011, M05.012, and M05.019.

Code Identity

ICD-10-CM Code
M05
Billable Status
No — Non-Billable Category
Code Describes
Rheumatoid arthritis with rheumatoid factor
Short Description
Rheumatoid arthritis with rheumatoid factor
Same as the full description in the CMS dataset.
Chapter
M05-M14
Inflammatory polyarthropathies

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM05-M14Inflammatory polyarthropathies
CategoryM05Rheumatoid arthritis with rheumatoid factor
This CodeM05Rheumatoid arthritis with rheumatoid factor

Specific Coding for Rheumatoid arthritis with rheumatoid factorOverview

Non-specific codes like M05 require more characters. Use one of these billable codes instead:

  • M05.0 for Felty's syndrome

  • Use M05.00 for Felty's syndrome, unspecified site

  • M05.01 for Felty's syndrome, shoulder

  • M05.02 for Felty's syndrome, elbow

  • M05.03 for Felty's syndrome, wrist

  • M05.04 for Felty's syndrome, hand

  • M05.05 for Felty's syndrome, hip

  • M05.06 for Felty's syndrome, knee

  • M05.07 for Felty's syndrome, ankle and foot

  • Use M05.09 for Felty's syndrome, multiple sites

  • M05.1 for Rheumatoid lung disease with rheumatoid arthritis

  • Use M05.10 for Rheumatoid lung disease with rheumatoid arthritis of unspecified site

  • M05.11 for Rheumatoid lung disease with rheumatoid arthritis of shoulder

  • M05.12 for Rheumatoid lung disease with rheumatoid arthritis of elbow

  • M05.13 for Rheumatoid lung disease with rheumatoid arthritis of wrist

  • M05.14 for Rheumatoid lung disease with rheumatoid arthritis of hand

  • M05.15 for Rheumatoid lung disease with rheumatoid arthritis of hip

  • M05.16 for Rheumatoid lung disease with rheumatoid arthritis of knee

  • M05.17 for Rheumatoid lung disease with rheumatoid arthritis of ankle and foot

  • Use M05.19 for Rheumatoid lung disease with rheumatoid arthritis of multiple sites

  • M05.2 for Rheumatoid vasculitis with rheumatoid arthritis

  • Use M05.20 for Rheumatoid vasculitis with rheumatoid arthritis of unspecified site

  • M05.21 for Rheumatoid vasculitis with rheumatoid arthritis of shoulder

  • M05.22 for Rheumatoid vasculitis with rheumatoid arthritis of elbow

  • M05.23 for Rheumatoid vasculitis with rheumatoid arthritis of wrist

  • M05.24 for Rheumatoid vasculitis with rheumatoid arthritis of hand

  • M05.25 for Rheumatoid vasculitis with rheumatoid arthritis of hip

  • M05.26 for Rheumatoid vasculitis with rheumatoid arthritis of knee

  • M05.27 for Rheumatoid vasculitis with rheumatoid arthritis of ankle and foot

  • Use M05.29 for Rheumatoid vasculitis with rheumatoid arthritis of multiple sites

  • M05.3 for Rheumatoid heart disease with rheumatoid arthritis

  • Use M05.30 for Rheumatoid heart disease with rheumatoid arthritis of unspecified site

  • M05.31 for Rheumatoid heart disease with rheumatoid arthritis of shoulder

  • M05.32 for Rheumatoid heart disease with rheumatoid arthritis of elbow

  • M05.33 for Rheumatoid heart disease with rheumatoid arthritis of wrist

  • M05.34 for Rheumatoid heart disease with rheumatoid arthritis of hand

  • M05.35 for Rheumatoid heart disease with rheumatoid arthritis of hip

  • M05.36 for Rheumatoid heart disease with rheumatoid arthritis of knee

  • M05.37 for Rheumatoid heart disease with rheumatoid arthritis of ankle and foot

  • Use M05.39 for Rheumatoid heart disease with rheumatoid arthritis of multiple sites

  • M05.4 for Rheumatoid myopathy with rheumatoid arthritis

  • Use M05.40 for Rheumatoid myopathy with rheumatoid arthritis of unspecified site

  • M05.41 for Rheumatoid myopathy with rheumatoid arthritis of shoulder

  • M05.42 for Rheumatoid myopathy with rheumatoid arthritis of elbow

  • M05.43 for Rheumatoid myopathy with rheumatoid arthritis of wrist

  • M05.44 for Rheumatoid myopathy with rheumatoid arthritis of hand

  • M05.45 for Rheumatoid myopathy with rheumatoid arthritis of hip

  • M05.46 for Rheumatoid myopathy with rheumatoid arthritis of knee

  • M05.47 for Rheumatoid myopathy with rheumatoid arthritis of ankle and foot

  • Use M05.49 for Rheumatoid myopathy with rheumatoid arthritis of multiple sites

  • M05.5 for Rheumatoid polyneuropathy with rheumatoid arthritis

  • Use M05.50 for Rheumatoid polyneuropathy with rheumatoid arthritis of unspecified site

  • M05.51 for Rheumatoid polyneuropathy with rheumatoid arthritis of shoulder

  • M05.52 for Rheumatoid polyneuropathy with rheumatoid arthritis of elbow

  • M05.53 for Rheumatoid polyneuropathy with rheumatoid arthritis of wrist

  • M05.54 for Rheumatoid polyneuropathy with rheumatoid arthritis of hand

  • M05.55 for Rheumatoid polyneuropathy with rheumatoid arthritis of hip

  • M05.56 for Rheumatoid polyneuropathy with rheumatoid arthritis of knee

  • M05.57 for Rheumatoid polyneuropathy with rheumatoid arthritis of ankle and foot

  • Use M05.59 for Rheumatoid polyneuropathy with rheumatoid arthritis of multiple sites

  • M05.6 for Rheumatoid arthritis with involvement of other organs and systems

  • Use M05.60 for Rheumatoid arthritis of unspecified site with involvement of other organs and systems

  • M05.61 for Rheumatoid arthritis of shoulder with involvement of other organs and systems

  • M05.62 for Rheumatoid arthritis of elbow with involvement of other organs and systems

  • M05.63 for Rheumatoid arthritis of wrist with involvement of other organs and systems

  • M05.64 for Rheumatoid arthritis of hand with involvement of other organs and systems

  • M05.65 for Rheumatoid arthritis of hip with involvement of other organs and systems

  • M05.66 for Rheumatoid arthritis of knee with involvement of other organs and systems

  • M05.67 for Rheumatoid arthritis of ankle and foot with involvement of other organs and systems

  • Use M05.69 for Rheumatoid arthritis of multiple sites with involvement of other organs and systems

  • M05.7 for Rheumatoid arthritis with rheumatoid factor without organ or systems involvement

  • Use M05.70 for Rheumatoid arthritis with rheumatoid factor of unspecified site without organ or systems involvement

  • M05.71 for Rheumatoid arthritis with rheumatoid factor of shoulder without organ or systems involvement

  • M05.72 for Rheumatoid arthritis with rheumatoid factor of elbow without organ or systems involvement

  • M05.73 for Rheumatoid arthritis with rheumatoid factor of wrist without organ or systems involvement

  • M05.74 for Rheumatoid arthritis with rheumatoid factor of hand without organ or systems involvement

  • M05.75 for Rheumatoid arthritis with rheumatoid factor of hip without organ or systems involvement

  • M05.76 for Rheumatoid arthritis with rheumatoid factor of knee without organ or systems involvement

  • M05.77 for Rheumatoid arthritis with rheumatoid factor of ankle and foot without organ or systems involvement

  • Use M05.79 for Rheumatoid arthritis with rheumatoid factor of multiple sites without organ or systems involvement

  • Use M05.7A for Rheumatoid arthritis with rheumatoid factor of other specified site without organ or systems involvement

  • M05.8 for Other rheumatoid arthritis with rheumatoid factor

  • Use M05.80 for Other rheumatoid arthritis with rheumatoid factor of unspecified site

  • M05.81 for Other rheumatoid arthritis with rheumatoid factor of shoulder

  • M05.82 for Other rheumatoid arthritis with rheumatoid factor of elbow

  • M05.83 for Other rheumatoid arthritis with rheumatoid factor of wrist

  • M05.84 for Other rheumatoid arthritis with rheumatoid factor of hand

  • M05.85 for Other rheumatoid arthritis with rheumatoid factor of hip

  • M05.86 for Other rheumatoid arthritis with rheumatoid factor of knee

  • M05.87 for Other rheumatoid arthritis with rheumatoid factor of ankle and foot

  • Use M05.89 for Other rheumatoid arthritis with rheumatoid factor of multiple sites

  • Use M05.8A for Other rheumatoid arthritis with rheumatoid factor of other specified site

  • Use M05.9 for Rheumatoid arthritis with rheumatoid factor, unspecified

  • Use M05.A for Abnormal rheumatoid factor and anti-citrullinated protein antibody with rheumatoid arthritis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M05: its own notes plus those printed at block M00-M25 and Chapter 13. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block M00-M25 applies to 2,249 codes
  • Disorders affecting predominantly peripheral (limb) joints

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

  • rheumatic fever (I00)
  • juvenile rheumatoid arthritis (M08.-)
  • rheumatoid arthritis of spine (M45.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Notes

General instructions on how these codes are used.

From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name M05, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming M05: they are not reported together with it, unless the two conditions are unrelated.

  • R76.81 Abnormal rheumatoid factor and anti-citrullinated protein antibody without rheumatoid arthritis
    rheumatoid arthritis with rheumatoid factor (M05.-)

Code Also 1

These codes say M05 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • I27.21 Secondary pulmonary arterial hypertension
    rheumatoid arthritis (M05.-)

Patient EducationClinical

Rheumatoid Arthritis

Rheumatoid arthritis (RA) is a form of arthritis that causes pain, swelling, and stiffness in your joints. RA is an autoimmune disease. Although it is most common in the wrist and fingers, this disease can cause your immune system to attack any joint tissue. The inflammation (swelling) that comes with RA can also affect other body parts.

The full article covers:

  • What is rheumatoid arthritis?
  • Who is more likely to get rheumatoid arthritis?
  • What causes rheumatoid arthritis?
  • What are the symptoms of rheumatoid arthritis?
  • How is rheumatoid arthritis diagnosed?
  • What are the treatments for rheumatoid arthritis?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About M05Overview

What is the ICD-10 code for rheumatoid arthritis with rheumatoid factor?

M05 is the ICD-10-CM category for rheumatoid arthritis with rheumatoid factor, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is M05 (Rheumatoid arthritis with rheumatoid factor) a billable code?

No. This is a category header that groups the codes for rheumatoid arthritis with rheumatoid factor, and headers cannot be submitted on claims. Claims for rheumatoid arthritis with rheumatoid factor need a more specific code from this category, such as M05.00, M05.011, and M05.012.

Can M05 be reported with I00?

Not as a rule. The Excludes1 note on M05 lists "rheumatic fever (I00)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).